Door-lock.



' No. 783,731. PATENTED FEB. 28, 1905.

N. P. OTIS 81: A. SUNDH.

DOOR LOOK.

APPLIOATION FILED SEPT. 14. 1903.

WITNESSES: I NVENTORS @MW @f w... V BY ATTORNEY No. 33,731. Patented February 28, 190*.

*r'ries TENT OFFICE.

NORTON P. OTIS AND AUGUST SUNDH, OF YONKERS. NEW' YORK, ASSIGN- ORS TO OTIS ELEVATOR COMPANY, OF EAST ORANGE, NEW JERSEY, A CORPORATION OF NEW JElttdlGlt'. i

DOUFT LOGK.

SPECIFICATION formi'ueg par of L r Patent N 783,731, dated February 28, 1905.

Application filed September 14, 1903. Serial No. 173,112.

To a, whom it mm concern: ably so formed that when free to move on its Be it known that we, Non'roN I Orrs and pivot its end adjacent the tumbler 7) will fall AUG-Us'r SUNDH, citizens of the United States, to the bottom of the casing. To assist this 5 residing at Yonkers, in the county of est gravity operation of the arm 7)", it is provided chester and State of New York, have invented with an enlarged portion 7], which acts as a certain new and use'i'ulImprovements in Doorcounterweight and also as an operating-sur- Locks, of which the following is a specific: face for the arm. When the end of the arm tion. adjacent the tumbler is at the bottom of the Our invention relates to door-locks, and parcasing, the portion 7) moves out to a position 10 ticularly to that class of door-locks which are as shown in Fig. 2. The tumbler 75 is pro used on doors For closing the entrance to an vided with a projection 7)", which adapted elevator well or hatchway at each landing. to engage with a serrated portion 7) oi the We will describe a door-look embodying casing. Should an attempt be made to move our invention and then point out the novel thebolt or latch 7) through the knob andspinfeatures thereof in claims. dle, the bolt or latch will engage the tumbler In the accompanyingdrawings, Figure lis a and force the projection 7) into one of the view, partly in elevation and partly in vertiserrations. This engagement of the serration cal section, of a portion of a door provided by the tumbler will hold the bolt or latch with a lock embodying our invention and should the end of the arm 7) fall while the at- 20 showing the application of our invention at a tempted movement of the bolt or latch is conlanding for an elevator-car. Fig. 2 is a view tinned through the knob or spindle. in elevation oi the door-lock shown in Fig. 1 In the application of my invention to a door with the parts in a position diflerent from controllingan entrance to an elevator well or that shown in Fig. 1. A plate forming part hatchway at a landing I provide means for 25 of the casing of the lock is removed, as in Fig. holding the arm 7)" raised to have the tumbler 1, to show the interior of the lock. 7) behind the bolt or latch, and thus prevent Similar letters of reference designate corthe door being opened eXoe-ptwhen the elevaresponding parts in both of the figures. vator-car is in proper posit on at the landing. 7 5

i A designates a portion of a door, and B a These means are operated by the elevator-car 3o lock for the door. The lock B comprises a when the elevator-car is in proper position at suitable casing 7), a bolt or latch 7), which the landing. As shown, the means for holdslides into and out of its keeper on guides ing the end of the arm 7) raised consists of a and a tumbler 7). The bolt or latch is moved lever I), so arranged or countcrweighted as into and out of its keeper by means of an arm to have its end (7 push in the portion 7) of the 3,5 7), carried by a spindle-sleeve 7)". The tumarm 7)" to move the arm 7)" on its pivot and bler 7) is movable into and out of position behave its end move the tumbler 7) behind the hind the bolt or latch 7). It is moved into bolt or latch. The other end, (7, oi the lever position behind the bolt or latch 7) by means may be providedwith a roller and is adapted 01 an arm 7)", and when in position behind the to be engaged by a cam or projection It, so ar- 4 bolt or latch 7) the bolt or latch cannot be ranged on the elevator-car that it will move moved out of its keeper by the doorspi1'idle. the lever l.) on its pivot to allow the end 01 As here shown, the tumbler tends to move the arm 7) to fall only when the elevator-car from behind the bolt or latch by gravity, and is in proper position at the laiiding. The lethis movement by gravity takes place when ver may be pivoted to some iixed part of the the end of the army 7) adjacent the tumbler well or pit and adjacent the lock B.

Falls to the bottom of the casing. The arm The operation of the lock in connection 7) is pivoted within the casing and is preterwith an elevator-car is as follows: Normally the lever D operates the arm 7/ to have it move the tumbler behind the bolt or latch, in which position of thetumblertsee Fig. 1) the bolt or latch cannot be withdrawn from its keeper. When an elevator-car is at the landing and in proper position, the cam E Will rock the lever D on its pivot to move its end (I from out of engagement with the arm 7; and allow the end of the lever and the tumbler to fall to the position shown in Fig. 2, in which position of' the tumbler the bolt or latch can be moved out of its keeper and the door opened. If, however, any one is trying to unlatch the door by attempting to turn the spindle-sleeve b as the car passes a landing, the tumbler 7f will be held behind the bolt or latch 7/ by the pressure on the spindle-sleeve, so that the door will remain locked.

hat we claim as our invention is- 1. The combination in a door-lock, of a casing, a bolt or latch, means for moving the bolt or latch into and out of its keeper, a tumbler to prevent the bolt or latch being moved out of its keeper, means for projecting the tumbler behind the bolt or latch, and means for preventing a movement of the tumbler when the bolt or latch is pressed against said tumbler.

2. The combination in a doo1'-lock, of a casing, a bolt or latch, means for moving the bolt or latch into and out of its keeper, a vertically-movable bolt or tumbler to prevent the bolt or latch being moved out of its keeper, means for lifting the tumbler into locking position, and means operated upon a movement of the bolt or latch for retaining the tumbler in said locking position.

8. The combination in a door-lock, of a casing, a bolt or latch, means for moving the bolt or latch into and out of its keeper, a tumbler to prevent the bolt or latch being moved out of its keeper, means for projecting the tumbler behind the bolt or latch, and means carried by the tumbler for engaging said casing to prevent a movement of the tumbler when the bolt or latch is pressed against said tumbler.

4. The combination in a door-lock, of a casing having a serrated portion, a bolt or latch, means for moving the bolt or latch into and out of its keeper, a tumbler adapted when moved behind the bolt or latch to prevent movement of the bolt or latch, means for moving the tumbler behind the bolt or latch and a projection carried by the tumbler which is adapted for engagement of the serrated portion.

5. The combination in a door-lock, of a casing having a serrated portion, a bolt or latch, means for moving the bolt or latch into and out of its keeper, a tumbler adapted when moved behind the bolt or latch to prevent movement of the bolt or latch, means for moving the tumbler behind the bolt or latch, and a projection carried by the tumbler which is adapted for engagement with the serrated portion, which engagement prevents the tumbler from moving from behind the bolt or latch while the bolt or latch is pressed against the tumbler.

6. The combination of a-door closing the entrance to an elevator well or hatchway, a lock for said door, said lock comprising a casing having a serrated portion, a bolt or latch and a tumbler carrying a projection; a pivoted arm for moving the tumbler behind the bolt or latch to prevent the bolt or latch being withdrawn from its keeper, and a device operated by the elevator-car for effecting said arm to permit the tumbler to move from behind the bolt or latch.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

NORTON P. OTIS. AUGUST SUNDH.

Witnssses:

IIENRY E. KIRBY, ERNEST V. MARsHALL. 

